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        <p><span style="color:Chocolate;text-align:center;display:inline-block;width:100%;">闲时与你立黄昏，笑问灶前粥可温。</span><br><span id="more"></span></p>
<h4 id="mysql常用的函数"><a href="#mysql常用的函数" class="headerlink" title="mysql常用的函数"></a>mysql常用的函数</h4><h5 id="to-days-函数"><a href="#to-days-函数" class="headerlink" title="to_days()函数"></a><code>to_days()</code>函数</h5><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">select to_days(now());</span><br><span class="line">-- 返回从0年到现在的天数</span><br></pre></td></tr></table></figure>
<h5 id="date-sub-date-interval-expr-type"><a href="#date-sub-date-interval-expr-type" class="headerlink" title="date_sub(date, interval expr type)"></a><code>date_sub(date, interval expr type)</code></h5><p>date参数是合法的日期表达式；</p>
<p>expr参数是您希望添加的时间间隔；</p>
<p>type参数可以是下列值：</p>
<div class="table-container">
<table>
<thead>
<tr>
<th style="text-align:left">Type 值</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">MICROSECOND</td>
</tr>
<tr>
<td style="text-align:left">SECOND</td>
</tr>
<tr>
<td style="text-align:left">MINUTE</td>
</tr>
<tr>
<td style="text-align:left">HOUR</td>
</tr>
<tr>
<td style="text-align:left">DAY</td>
</tr>
<tr>
<td style="text-align:left">WEEK</td>
</tr>
<tr>
<td style="text-align:left">MONTH</td>
</tr>
<tr>
<td style="text-align:left">QUARTER</td>
</tr>
<tr>
<td style="text-align:left">YEAR</td>
</tr>
<tr>
<td style="text-align:left">SECOND_MICROSECOND</td>
</tr>
<tr>
<td style="text-align:left">MINUTE_MICROSECOND</td>
</tr>
<tr>
<td style="text-align:left">MINUTE_SECOND</td>
</tr>
<tr>
<td style="text-align:left">HOUR_MICROSECOND</td>
</tr>
<tr>
<td style="text-align:left">HOUR_SECOND</td>
</tr>
<tr>
<td style="text-align:left">HOUR_MINUTE</td>
</tr>
<tr>
<td style="text-align:left">DAY_MICROSECOND</td>
</tr>
<tr>
<td style="text-align:left">DAY_SECOND</td>
</tr>
<tr>
<td style="text-align:left">DAY_MINUTE</td>
</tr>
<tr>
<td style="text-align:left">DAY_HOUR</td>
</tr>
<tr>
<td style="text-align:left">YEAR_MONTH</td>
</tr>
</tbody>
</table>
</div>
<h4 id="使用的注解汇总"><a href="#使用的注解汇总" class="headerlink" title="使用的注解汇总"></a>使用的注解汇总</h4><h5 id="EnableScheduling"><a href="#EnableScheduling" class="headerlink" title="@EnableScheduling"></a><code>@EnableScheduling</code></h5><blockquote>
<p>SpringBoot 提供了 <code>@EnableScheduling</code> 和 <code>@Scheduled</code>注解，用于支持定时任务的执行。</p>
</blockquote>
<p>在SpringBoot的启动类上添加<code>@EnableScheduling</code>注解，它属于Spring Context模块的注解，其内部通过<code>@Import(SchedulingConfiguration.class)</code>注解引入了<code>SchedulingConfiguration</code>；</p>
<h5 id="EnableAsync"><a href="#EnableAsync" class="headerlink" title="@EnableAsync"></a><code>@EnableAsync</code></h5><h4 id="java实体类"><a href="#java实体类" class="headerlink" title="java实体类"></a>java实体类</h4><div class="table-container">
<table>
<thead>
<tr>
<th>简称</th>
<th>全程</th>
<th>中文说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>PO</td>
<td>persistent object</td>
<td>持久对象</td>
</tr>
<tr>
<td>VO</td>
<td>view object / value object</td>
<td>表现层对象</td>
</tr>
<tr>
<td>DTO</td>
<td>data transfer object</td>
<td>数据传输对象</td>
</tr>
<tr>
<td>POJO</td>
<td>plain ordinary java object / pure old java object</td>
<td>简单无规则java对象</td>
</tr>
<tr>
<td>BO/DO</td>
<td>business object / domain object</td>
<td>业务对象/域对象</td>
</tr>
<tr>
<td>DAO</td>
<td>data access object</td>
<td>数据访问对象</td>
</tr>
</tbody>
</table>
</div>
<h4 id="自定义校验器（实现ConstraintValidator）"><a href="#自定义校验器（实现ConstraintValidator）" class="headerlink" title="自定义校验器（实现ConstraintValidator）"></a>自定义校验器（实现ConstraintValidator）</h4><ol>
<li><p>自定义注解</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Target({ElementType.FIELD})</span></span><br><span class="line"><span class="meta">@Retention(RetentionPolicy.RUNTIME)</span></span><br><span class="line"><span class="meta">@Documented</span></span><br><span class="line"><span class="meta">@Constraint(</span></span><br><span class="line"><span class="meta">    validatedBy = {MobileNoValidator.class}</span></span><br><span class="line"><span class="meta">)</span></span><br><span class="line"><span class="keyword">public</span> <span class="meta">@interface</span> MobileNo {</span><br><span class="line">    String <span class="title function_">message</span><span class="params">()</span> <span class="keyword">default</span> <span class="string">"手机号格式不正确"</span>;</span><br><span class="line"></span><br><span class="line">    <span class="type">boolean</span> <span class="title function_">nullable</span><span class="params">()</span> <span class="keyword">default</span> <span class="literal">false</span>;</span><br><span class="line"></span><br><span class="line">    <span class="type">boolean</span> <span class="title function_">blankable</span><span class="params">()</span> <span class="keyword">default</span> <span class="literal">false</span>;</span><br><span class="line"></span><br><span class="line">    Class&lt;?&gt;[] groups() <span class="keyword">default</span> {};</span><br><span class="line"></span><br><span class="line">    Class&lt;? <span class="keyword">extends</span> <span class="title class_">Payload</span>&gt;[] payload() <span class="keyword">default</span> {};</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
</li>
<li><p>注解校验类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MobileNoValidator</span> <span class="keyword">implements</span> <span class="title class_">ConstraintValidator</span>&lt;MobileNo, String&gt; {</span><br><span class="line">    <span class="keyword">private</span> <span class="type">boolean</span> nullable;</span><br><span class="line">    <span class="keyword">private</span> <span class="type">boolean</span> blankable;</span><br><span class="line">    <span class="keyword">private</span> String message;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="title function_">MobileNoValidator</span><span class="params">()</span> {</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">initialize</span><span class="params">(MobileNo constraintAnnotation)</span> {</span><br><span class="line">        <span class="built_in">this</span>.nullable = constraintAnnotation.nullable();</span><br><span class="line">        <span class="built_in">this</span>.message = constraintAnnotation.message();</span><br><span class="line">        <span class="built_in">this</span>.blankable = constraintAnnotation.blankable();</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">public</span> <span class="type">boolean</span> <span class="title function_">isValid</span><span class="params">(String value, ConstraintValidatorContext context)</span> {</span><br><span class="line">        <span class="keyword">if</span> (value == <span class="literal">null</span>) {</span><br><span class="line">            <span class="keyword">if</span> (!<span class="built_in">this</span>.nullable) {</span><br><span class="line">                <span class="comment">//禁止默认消息返回</span></span><br><span class="line">                context.disableDefaultConstraintViolation();</span><br><span class="line">                <span class="comment">//自定义返回消息</span></span><br><span class="line">                context.buildConstraintViolationWithTemplate(<span class="string">"手机号不能为空"</span>).addConstraintViolation();</span><br><span class="line">                <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">            } <span class="keyword">else</span> {</span><br><span class="line">                <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">            }</span><br><span class="line">        } <span class="keyword">else</span> <span class="keyword">if</span> (value.length() == <span class="number">0</span>) {</span><br><span class="line">            <span class="keyword">if</span> (!<span class="built_in">this</span>.blankable) {</span><br><span class="line">                context.disableDefaultConstraintViolation();</span><br><span class="line">                context.buildConstraintViolationWithTemplate(<span class="string">"手机号不能为空白"</span>).addConstraintViolation();</span><br><span class="line">                <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">            } <span class="keyword">else</span> {</span><br><span class="line">                <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">            }</span><br><span class="line">        } <span class="keyword">else</span> <span class="keyword">if</span> (!AppUtils.isMobile(value)) {</span><br><span class="line">            context.disableDefaultConstraintViolation();</span><br><span class="line">            context.buildConstraintViolationWithTemplate((String)StringUtils.defaultIfBlank(<span class="built_in">this</span>.message, <span class="string">"手机号格式不对"</span>)).addConstraintViolation();</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">        } <span class="keyword">else</span> {</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        }</span><br><span class="line">    }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<blockquote>
<p>该接口使用了泛型，第一个参数是<strong>自定义注解类</strong>，第二个是要校验的<strong>数据类型</strong>。<br>重写的两个方法，initialize为初始化方法，可以在里面做一些初始化操作，isValid方法写我们自定义的校验逻辑</p>
</blockquote>
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